The already large guest cast that Arrow has lined up for its upcoming fourth season is getting even bigger. The CW series has added two more guest stars that will have important roles in Season 4, and both performers are most definitely familiar with genre shows. As first reported by The Wrap, Teen Wolf‘s JR Bourne will appear in the third episode of Arrow Season 4 as Jeremy Tell, better known as the DC Comics villain Double Down, “a metahuman who can turn his...